Fix potentially adding the same skin multiple times
Fix potentially adding the same skin multiple times

UselessToucan/osu,UselessToucan/osu,peppy/osu,ppy/osu,NeoAdonis/osu,peppy/osu-new,smoogipoo/osu,smoogipoo/osu,peppy/osu,ppy/osu,UselessToucan/osu,smoogipoo/osu,peppy/osu,ppy/osu,smoogipooo/osu,NeoAdonis/osu,NeoAdonis/osu